well then they will be in a heap load of trouble with the FCC. i doubt they want to pay hefty fines. like i said, the only way it could be there is if they documents are under some sort of confidentiality so the public wouldn't know. the ones that are released says nothing about a 3G chip, nor is the iphone listed under 3G devices on the FCC's website.
As I already said, the actual technical documents given to the FCC for approval are under permanent confidentiality and even the other ones are under temporary confidentiality but haven't yet reached their release date. It is possible.